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Article Dans Une Revue Chinese Physics B Année : 2021

57 Fe Mössbauer spectrometry: A powerful technique to analyze the magnetic and phase characteristics in RE–Fe–B permanent magnets

Résumé

This review summarizes the recent advances on the application of 57 Fe Mössbauer spectrometry to study the magnetic and phase characteristics of Nd–Fe–B-based permanent magnets. First of all, the hyperfine structures of the Ce 2 Fe 14 B, (Ce, Nd) 2 Fe 14 B and MM 2 Fe 14 B phases are well-defined by using the model based on the Wigner-Seitz analysis of the crystal structure. The results show that the isomer shift δ and the quadrupole splitting Δ E Q of those 2:14:1 phases show minor changes with the Nd content, while the hyperfine field B hf increases monotonically with increasing Nd content and its value is influenced by the element segregation and phase separation in the 2:14:1 phase. Then, the hyperfine structures of the low fraction secondary phases are determined by the 57 Fe Mössbauer spectrometry due to its high sensitivity. On this basis, the content, magnetic behavior, and magnetization of the REFe 2 phase, the amorphous grain boundary (GB) phase, and the amorphous worm-like phase, as well as their effects on the magnetic properties, are systematically studied.
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hal-04107201 , version 1 (26-05-2023)

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Lizhong Zhao, Xuefeng Zhang, Mi Yan, Zhongwu Liu, Jean-Marc Greneche. 57 Fe Mössbauer spectrometry: A powerful technique to analyze the magnetic and phase characteristics in RE–Fe–B permanent magnets. Chinese Physics B, 2021, 30 (1), pp.013302. ⟨10.1088/1674-1056/abc53d⟩. ⟨hal-04107201⟩
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